Inversion of Control (IoC) 仕組み分かりやすいPHPサンプル

class IoC {
    protected static $registry = [];
    public static function bind($name, Callable $resolver)
    {
        static::$registry[$name] = $resolver;
    }
    public static function make($name)
    {
        if (isset(static::$registry[$name]))
        {
            $resolver = static::$registry[$name];
            return $resolver();
        }
        throw new Exception('Alias does not exist in the IoC registry.');
    }
}


class Foo {}

class IoCTest extends PHPUnit_Framework_TestCase {
    public function test_can_resolve_out_of_the_ioc_container()
    {
        IoC::bind('foo', function()
        {
            return new Foo;
        });
        $this->assertInstanceOf('Foo', IoC::make('foo'));
    }
}